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OpenWebGIS is online Geographic Information System

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Creating WiFi map and monitoring access points based on geographic information system (OpenWebGIS)

«Wi-Fi (or WiFi) is a local area wireless computer networking technology that allows electronic devices to connect to the network, mainly using the 2.4 gigahertz (12 cm) UHF and 5 gigahertz (6 cm) SHF ISM radio bands»
In order to use the WiFi access point (or hotspot) it is necessary to know the geographic location of this point and its parameters (properties), for example, such as network name, authentication, key management, and encryption schemes, frequency, signal level, etc.
Already for some time there are public WiFi location databases with this information. There are many applications for access to these databases and applying it on the map. But maybe you want to create for yourself the WiFi map of the place you have visited, or maybe you want to collect and monitor (for example every 5, 10, 30 seconds or a minute, an hour, etc.) parameters of WiFi-points? Do you want to create a map legend, mathematically analyze the information about a detected access point, export this data to popular GIS formats (gml, kml, geoJSON, osm, gpx or csv)? Then use OpenWebGIS version for Android. OpenWebGIS is free & open Geographic information system (GIS).

You can read more about it here